[FFmpeg-cvslog] avcodec/evc_ps: Check ref_pic_num and sps_max_dec_pic_buffering_minus1
Michael Niedermayer
git at videolan.org
Fri Sep 15 18:14:31 EEST 2023
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Aug 1 00:56:34 2023 +0200| [4565747056a11356210ed8edcecb920105e40b60] | committer: Michael Niedermayer
avcodec/evc_ps: Check ref_pic_num and sps_max_dec_pic_buffering_minus1
Fixes: out of array write
Found-by: dongsookim at korea.ac.kr
Reviewed-by: James Almer <jamrial at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4565747056a11356210ed8edcecb920105e40b60
---
libavcodec/evc_ps.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/libavcodec/evc_ps.c b/libavcodec/evc_ps.c
index 64384a392c..28cf5378e4 100644
--- a/libavcodec/evc_ps.c
+++ b/libavcodec/evc_ps.c
@@ -24,10 +24,14 @@
#define EXTENDED_SAR 255
// @see ISO_IEC_23094-1 (7.3.7 Reference picture list structure syntax)
-static int ref_pic_list_struct(GetBitContext *gb, RefPicListStruct *rpl)
+static int ref_pic_list_struct(EVCParserSPS *sps, GetBitContext *gb, RefPicListStruct *rpl)
{
uint32_t delta_poc_st, strp_entry_sign_flag = 0;
rpl->ref_pic_num = get_ue_golomb_long(gb);
+
+ if ((unsigned)rpl->ref_pic_num > sps->sps_max_dec_pic_buffering_minus1)
+ return AVERROR_INVALIDDATA;
+
if (rpl->ref_pic_num > 0) {
delta_poc_st = get_ue_golomb_long(gb);
@@ -239,6 +243,8 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets *ps)
sps->max_num_tid0_ref_pics = get_ue_golomb_31(gb);
else {
sps->sps_max_dec_pic_buffering_minus1 = get_ue_golomb_long(gb);
+ if ((unsigned)sps->sps_max_dec_pic_buffering_minus1 > 16 - 1)
+ return AVERROR_INVALIDDATA;
sps->long_term_ref_pic_flag = get_bits1(gb);
sps->rpl1_same_as_rpl0_flag = get_bits1(gb);
sps->num_ref_pic_list_in_sps[0] = get_ue_golomb(gb);
@@ -248,8 +254,11 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets *ps)
goto fail;
}
- for (int i = 0; i < sps->num_ref_pic_list_in_sps[0]; ++i)
- ref_pic_list_struct(gb, &sps->rpls[0][i]);
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[0]; ++i) {
+ ret = ref_pic_list_struct(sps, gb, &sps->rpls[0][i]);
+ if (ret < 0)
+ goto fail;
+ }
if (!sps->rpl1_same_as_rpl0_flag) {
sps->num_ref_pic_list_in_sps[1] = get_ue_golomb(gb);
@@ -257,8 +266,11 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets *ps)
ret = AVERROR_INVALIDDATA;
goto fail;
}
- for (int i = 0; i < sps->num_ref_pic_list_in_sps[1]; ++i)
- ref_pic_list_struct(gb, &sps->rpls[1][i]);
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[1]; ++i) {
+ ret = ref_pic_list_struct(sps, gb, &sps->rpls[1][i]);
+ if (ret < 0)
+ goto fail;
+ }
}
}
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